The Broncos may be down a key member of their interior defensive line as Sunday’s season-opener approaches.

Defensive tackle Malcolm Roach suffered a calf strain during Thursday’s practice, sources told The Denver Post. It’s a Grade 2 strain, a source said, a designation that covers a broad range of possible injury but casts doubt on Roach’s availability to play against Tennessee on Sunday, approximately 72 hours post-injury.

The defensive tackle left Thursday’s practice during the period open to reporters, and was later designated on the team’s injury report as limited (calf). If Roach is indeed out Sunday, it’ll mean more rotational reps for backups Jordan Jackson and Eyioma Uwazurike, as Denver carried seven defensive linemen on its initial 53-man roster.

Beyond Roach, Denver has mor

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